Monogamy under attack?

During the debate over same-sex marriage, opponents who raised the issue of the splintering of the understanding of marriage, with the concomitant arrival of societal acceptance of such issues as polygamy were called alarmists and accused of injecting red herring fallacies into the debate. To those who were so accused, I offer the following link to a CNN story which argues that monogamy is not a "realistic" lifestyle to maintain.

http://www.cnn.com/2009/LIVING/10/28/monogamy.realistic.today/index.html

Next up, bestiality?